Reverberation loudspeaker



Sept- 1964 w. REHDE REVERBERATION LOUDSPEAKER Filed May 31, 1962 UnitedStates Patent 3,149,692 REVERBERATION LOUDSPEAKER Weber Rehde, Bavans,Doubs, France Filed May 31, 1962, Ser. No. 199,053 Claims priority,application France, June 2, 1961, 863,727, Patent 1,291,272 4 Claims.(Cl. 181-27) One of the objects of the invention is to provide a methodenabling the vibrations of the diaphragm of a loudspeaker to bemaintained, and thus obtain the required re-echoing or echoing effect.

Another object of the invention is to produce a reechoing loudspeaker inwhich the vibrations of the loudspeaker are maintained withoutappreciably increasing the inertia of this diaphragm.

Other objects and advantages of the invention will be revealed by thefollowing description and the attached drawings, in which:

FIGURE 1 shows a diagrammatical section of a reechoing loudspeakeraccording to the invention,

FIGURE 2 is a right-hand view of FIGURE 1.

The re-echoing loudspeaker shown in FIGURE 1 consists of a wooden box 1or one made of similar material, of which one of the faces 1 comprisesan aperture around which a diaphragm 2 of the loudspeaker is fixed. Theface 1 also has an aperture 1 intended to permit the air contained inthe box 1 to circulate freely when the diaphragm is maintained invibration. This arrangement thus enables a cause of damping thevibrations of the loudspeaker to be avoided. In front of the wall of thebox 1 and at a certain distance from this wall a canvas 3 is stretchedacross the box of the loudspeaker.

The device enabling the re-echoing of sounds to be produced consists ofthree springs 4, 5, 6 which are each attached by their ends 4 4 5 5 and6 -6 to supports (not shown) fixed on the wall 1 of the box 1.

These three springs 4, 5, 6 are connected to each other at their middlepart by a metal rod 7. These three springs 4, 5, 6 are also connected tothe diaphragm 2 of the loudspeaker by a metal rod 8, which is attachedat one of its ends to the rod 7 and thus to the three springs.

The other end of the rod 8 is bent into ring shape 8 and fixed to thediaphragm 2 of the loudspeaker by glueing or other means. This ring 8forms the resonance ring which transmits the vibrations of the diaphragmto the springs, these vibrations of the diaphragm being thus maintainedby the vibrations of the springs.

The characteristics of these springs (section of the Wire, number ofturns per centimeter, kind of metal and Patented Sept. .22, 1964 thelike) as Well as the tension of these springs'should be selectedaccording to the effect required.

This device thus enables a re-echoing loudspeaker of great strength tobe obtained in a simple manner.

Obviously, the invention is not restricted to the abovementionedexamples of embodiments, for which other alternatives could be providedwithout going outside of the scope of the invention for that purpose.

What I claim is:

l. A reverberation loudspeaker comprising a box provided in one wailwith an opening, a loudspeaker diaphragm inside the box connected at itsedge to said wall around said opening, a substantially straight coilspring outside said Wall extending across said opening, means supportingthe opposite ends of the spring, and means connecting the middle part ofthe spring to said dia phragm for transmitting vibrations of thediaphragm to the spring.

2. A reverberation loudspeaker comprising a box provided in one wallwith an opening, a loudspeaker diaphragm inside the box connected at itsedge to said Wall around said opening, substantially straight andparallel coil springs outside said Wall extending across said opening,means supporting the opposite ends of each spring, means rigidlyconnecting the middle parts of the springs, a rod rigidly connectingsaid diaphragm with said middle parts of the springs.

3. A reverberation loudspeaker comprising a box provided in one Wallwith an opening, a loudspeaker diaphragm inside the box connected at itsedge to said wall around said opening, substantially straight andparallel coil springs outside said wall extending across said opening,means supporting the opposite ends of each spring, a rod rigidlyconnecting the middle parts of the springs, a resonance ring secured tothe diaphragm concentrically therewith, and a rod rigidly connectingsaid ring with said first-mentioned rod.

4. A reverberation loudspeaker comprising a support, a loudspeakerdiaphragm connected to said support, and at least one straight springextending across the diaphragm, the spring being connected by both endsto the support and by its middle point to said diaphragm, wherebyvibrations of the loudspeaker diaphragm will be transmitted mechanicallyto the spring and maintained thereby.

References Cited in the file of this patent UNITED STATES PATENTS2,768,235 Knoblaugh Oct. 23, 1956 2,853,145 Martin Sept. 23, 1958

1. A REVERBERATION LOUDSPEAKER COMPRISING A BOX PROVIDED IN ONE WALLWITH AN OPENING, A LOUDSPEAKER DIAPHRAGM INSIDE THE BOX CONNECTED AT ITSEDGE TO SAID WALL AROUND SAID OPENING, A SUBSTANTIALLY STRAIGHT COILSPRING OUTSIDE SAID WALL EXTENDING ACROSS SAID OPENING, MEANS SUPPORTINGTHE OPPOSITE ENDS OF THE SPRING, AND MEANS CONNECTING THE MIDDLE PART OFTHE SPRING TO SAID DIAPHRAGM FOR TRANSMITTING VIBRATIONS OF THEFIAPHRAGM TO THE SPRING.